CODESYS - the IEC 61131-3 automation software

initialize variables
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Author:  Thomassmets [ Wed Jan 16, 2019 1:57 pm ]
Post subject:  initialize variables

Dear all,
I have tried to initialize my variables ( init: BOOL := 1; ).
This works the first time I run the program.
If I stop the program and run it again (or if I build again, login and start the program) its not initialized again.
How can I fix this ?
I would like to initialize my variable everytime I start the program.

Author:  JAPIB [ Wed Jan 16, 2019 11:03 pm ]
Post subject:  Re: initialize variables

Only a hot Reset or a cold Reset intialize variables.
When you build your program, login and start it, it's like a Reset.

I think you have to write a small program to initialize your variables each time you simply run the program.

For exemple :
(*GVL declaration*)
xInitialisation_OK :BOOL; (*This variable is FALSE each time your PLC start*)
(*Begin of your program*)
IF NOT xInitialisation_OK then (*IF xInitialisation_OK is FALSE, it's the first cycle of scrutation*)
xvariable1:= ... ; (*write the initial value you want *)
xvariable2:=... ;
xInitialisation_OK :=TRUE; (*Initialization is finish*)

You can also write this program in a "StartDone" System Event.


Author:  Thomassmets [ Thu Jan 17, 2019 5:31 pm ]
Post subject:  Re: initialize variables

Thank you !

I have fixed it with the StartDone Event.

Thanks for the reply..


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